使用改良AES架構之分離結構加密法

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Please use this identifier to cite or link to this item: http://140.128.103.80:8080/handle/310901/31443

Title:	使用改良AES架構之分離結構加密法
Other Titles:	Separate Structure Cryptography by Using Improved AES Architecture
Authors:	陳俊穎 Chen,Jyun-Ying
Contributors:	黃宜豊 Huang, Yi-Li 資訊工程學系
Keywords:	5G;AES;SSCUIA;IAESA;GDBRS;D-Box
Date:	2019
Issue Date:	2019-03-21T09:11:19Z (UTC)
Abstract:	無線通訊在2020將是5G時代，其下載傳輸速率介於1~10Gbps，約為4G-LTE的40倍速，是而目前支援4G加/解密的AES，其效能將無法達到5G的要求，此外，AES亦正面臨被破密的危機，如何創新構建一全新的訊息加密機制，使其能有更高的安全與效能，為當今重要的研究課題；基於此，本研究提出一全新的加密方法，稱為“使用改良AES架構之分離結構加密法(Separate Structure Cryptography by Using Improved AES Architecture, SSCUIA for short)”，其中分離結構加密機制為本研究提出的一創新機制，可以有效提升整體加/解密之安全與效能，本研究另一特色為使用改良AES架構(Improved AES Architecture, IAESA for short)來增強系統整體安全度。IAESA使用一全新設計的金鑰擴展演算法，稱為GDBRS (Generating Dynamic Box, Round Keys and Shifting Key)用來取代AES原有的金鑰擴展法，在GDBRS中擴展輸入密碼(PW) 的範圍，其長度介於8 ~ 800000 bits，並藉由此PW產生一16X16動態盒(D-Box)，接著以此D-Box來產生回合金鑰與位移金鑰；在IAESA中，由於GDBRS的作用，能有效提升D-Box、回合金鑰與位移金鑰的安全性，而藉由Shifting-SubBytes (S-SubBytes, for short)運算取代AES-SubBytes運算，可以增益安全強度，使得將原本AES的10回合運算縮減為3回合，仍能不損失安全度而有效改善效能。經由理論分析比較與效能實測證明，結合IAESA與分離結構加密機制的SSCUIA將比AES-128更加安全與快速。 In 2020, wireless communication will be the 5G era. Its download transmission rate is between 1~10Gbps, about 40 times speed of 4G-LTE, so that the performance of AES, which currently supports 4Gencryption/decryption, will not meet the requirements of 5G. In addition, AES is also facing a crisis of being cracked. How to innovate and construct a new cryptographic mechanism to enable it to have higher security and efficiency is an important research topic today. Based on this, this study proposes a new encryption method, it is called "Separate Structure Cryptography by Using Improved AES Architecture (SSCUIA for short)", in which the separation structure encryption mechanism is an innovative mechanism proposed by the research, it can effectively improve the overall encryption/decryption efficiency. Another feature of this study is the use of Improved AES Architecture (IAESA for short) to enhance the overall security of the system. IAESA uses a newly designed key-expanding algorithm called GDBRS (Generating Dynamic Box, Round Keys and Shifting Keys) to replace AES's original key expansion method. It extending the ranging of input password (PW), the length of PW is between 8 to 800,000 bits and generating a 16X16 dynamic box (D-Box) by employing the PW. Furthermore, the generated D-Box is used to generate round keys and shifting keys. Due to the contribution of GDBRS, the security of D-Box, round keys and shifting keys are effectively enhanced. Moreover, the using of Shifting-SubBytes (S-SubBytes, for short) operation to replace the AES-SubBytes operation can more effectively improved the security. Through which, in IAESA, it reduces the original AES's 10-round operations to 3 rounds, and still effectively improves performance without sacrificing safety. Under the theoretical analysis and performance test, the SSCUIA will be safer and faster than AES-128.
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